JRC JMA-9922-6XA Instruction Manual page 193

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Relative Vector Mode
In order to display the relative vector of a target, press the T/R VECT switch to select
the Relative Vector mode.
The relative vector does not represent the true motion of a target, but its relative relation
with the own ship. This means that a target with its relative vector directed at the own ship
(passing through the CPA LIMIT ring) is a dangerous target.
In the Relative Vector mode, the CPA LIMIT of targets can be seen at a glance .
‚ T
The true vector is not displayed.
CPA RING
Relative vector
Therefore, the TRUE/REL modes can be used in the following way: The TRUE vector can
be used to know the true aspect of a target, and the REL vector can be used to know the
closest point of approach (CPA) of a target.
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